Bus optical fiber including low mode volume light source optimally aligned

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EP 0 301 841 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	22.08.1990 Bulletin 1990/34

(43)	Date of publication A2:
	01.02.1989 Bulletin 1989/05

(21)	Application number: 88306934.6

(22)	Date of filing: 27.07.1988

(51)	International Patent Classification (IPC)⁴: H04B 9/00, G02B 6/42

(84)	Designated Contracting States:
	AT BE CH DE ES FR GB IT LI NL SE

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Priority:

29.07.1987 US 79546

(71)	Applicant: RAYCHEM CORPORATION (a Delaware corporation)
	Menlo Park, California 94025 (US)

(72)	Inventors:
	Zucker, Joseph Foster City California 94404 (US) Levinson, Frank Howard Redwood City California 94061 (US) Narciso, Ralph A. La Honda California 94020 (US)

(74)	Representative: Benson, John Everett et al
	Raychem Limited Intellectual Property Law Department Faraday Road Dorcan Swindon, Wiltshire SN3 5HH Swindon, Wiltshire SN3 5HH (GB)

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References cited: :

(54)	Bus optical fiber including low mode volume light source optimally aligned

(57) A distribution optical fiber network includes a light source (9) having a mode volume less than a distribution optical fiber (4), the light source being connected to the fiber so as to minimize the number and order of modes initially supported by the fiber by aligning an optical center of the light source with a geometric center of the fiber.
It has been surprisingly and unexpectedly discovered that optimally aligning geometric centers of a light emitting surface of a light transmitter with the geometric surface of an optical fiber end so as to achieve optimum light throughput at an opposite second optical fiber end is disadvantageous where the fiber is to be used in a distribution system with a plurality of side taps which induce a plurality of bends to the fiber, especially macrobends.

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